ArchLinux: 202002-8: systemd: privilege escalation

    Date 17 Feb 2020
    415
    Posted By LinuxSecurity Advisories
    The package systemd before version 244.2-1 is vulnerable to privilege escalation.
    Arch Linux Security Advisory ASA-202002-8
    =========================================
    
    Severity: High
    Date    : 2020-02-12
    CVE-ID  : CVE-2020-1712
    Package : systemd
    Type    : privilege escalation
    Remote  : No
    Link    : https://security.archlinux.org/AVG-1094
    
    Summary
    =======
    
    The package systemd before version 244.2-1 is vulnerable to privilege
    escalation.
    
    Resolution
    ==========
    
    Upgrade to 244.2-1.
    
    # pacman -Syu "systemd>=244.2-1"
    
    The problem has been fixed upstream in version 244.2.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    A heap use-after-free vulnerability was found in systemd before version
    244.2, where asynchronous Polkit queries are performed while handling
    dbus messages. A local unprivileged attacker can abuse this flaw to
    crash systemd services or potentially execute code and elevate their
    privileges, by sending specially crafted dbus messages.
    
    Impact
    ======
    
    A local unprivileged attacker is able to crash the system or execute
    arbitrary code as root by abusing polkit caching mechanisms.
    
    References
    ==========
    
    https://github.com/systemd/systemd/commit/ea0d0ede03c6f18dbc5036c5e9cccf97e415ccc2
    https://github.com/systemd/systemd-stable/commit/e2d4cb9843c50eff76e9104fec6b448c0d7c8814
    https://security.archlinux.org/CVE-2020-1712
    

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